CN116499414A - A contact diameter measuring device for an outer ring of an angular contact ball bearing and a method for using the same - Google Patents

Abstract

The application discloses an angular contact ball bearing outer ring contact diameter measuring device and a using method thereof, wherein the measuring device comprises a measuring platform, a reference plate is arranged above the measuring platform, a main shaft is arranged on the reference plate, one end of the main shaft is provided with a measuring standard cone and a retainer, the main shaft is connected with a driving assembly, and the driving assembly can drive the main shaft to reciprocate along the central axis of the main shaft and apply a measuring load to the main shaft and can also drive the main shaft to rotate along the central axis of the main shaft; the position of the measuring platform opposite to the main shaft forms a measuring station, the measured outer ferrule is arranged on the measuring station, and the sensor component on the measuring platform can measure and display the difference value between the contact diameter value of the measured outer ferrule and the contact diameter value of the outer ferrule for calibration. Therefore, the measuring device provided by the application can measure the contact diameter of the outer ring of the bearing, can realize the direct assembly of the bearing by matching with the contact diameter of the inner ring of the bearing, ensures the contact angle of the angular contact ball bearing, and reduces the deviation between the actual contact angle and the theoretical contact angle.

Description

A contact diameter measuring device for an outer ring of an angular contact ball bearing and a method for using the same

technical field

The present application relates to the technical field of rolling bearing manufacturing, in particular to a contact diameter measuring device for an outer ring of an angular contact ball bearing and a method for using the same.

Background technique

Precision angular contact ball bearings are an important type of high-end precision bearings. They are generally used in high-speed, high-precision rotary shaft systems. Multiple sets are used at the same time. Due to the high precision of the bearings and complicated installation and assembly, it is difficult for ordinary enterprises to achieve the best assembly state. Therefore, Bearing companies are required to make consistent parameters such as the contact angle and protrusion of the bearing.

Angular contact ball bearings are commonly used bearings in precision shafting, and generally more than two sets of bearings are used in combination. When two sets of bearings are paired together, the basic installation methods are: back-to-back DB installation (see Figure 1), face-to-face DF installation (see Figure 2) and series DT installation (see Figure 3). There are many other installation methods for multiple bearings. Taking triple bearings as an example, Figures 4, 5 and 6 show several installation methods of triple bearings.

In order to ensure the performance quality of the shafting and give full play to the best performance of the bearings, when assembling two or more bearings, the basic requirements are: ①The action point of the force is on the axis; ②Each set of bearings bears a certain preload; ③A set of bearings The stress should be even. Therefore, when installing angular contact ball bearings, it is necessary to ensure that the contact angle of the bearing is consistent, and finally adjust the axial clearance (negative clearance). The clearance value should be determined according to different operating conditions and coordination. The method is to control the protrusion and recess of the bearing end face. Therefore, the contact angle and protrusion of a single set of angular contact ball bearings are important technical parameters, which directly affect the installation and use of the bearing.

The protrusion of single set of angular contact ball bearings is zero, and the contact angle of paired bearings is equal to the basic requirements of paired bearings. At present, the passive grinding method is widely used at home and abroad to meet the requirements of paired bearings. Specifically, enterprises currently producing precision angular contact ball bearings at home and abroad usually strictly control the contact angle and the protrusion of the end face of the finished bearing during the production process, and use a protrusion meter to measure the protrusion of the end face of the pre-installed bearing to determine the protrusion. Then use the method of grinding the height of the bearing ring to ensure the protrusion of the bearing; calculate the contact angle of the bearing according to the theoretical clearance of the bearing, the radius of curvature of the groove, the diameter of the assembly ball, etc., and control the clearance of the bearing during the production process , Groove curvature, etc. indirectly control the contact angle, and judge whether the bearing contact angle is qualified through the contact angle measuring instrument.

The use of passive grinding method to control the contact angle in the production process has the following problems:

1. Due to the deviation of the clearance and the deviation of the curvature of the inner and outer ring grooves, there is a deviation between the calculated theoretical contact angle and the actual contact angle. For bearings with high requirements, a full inspection of the contact angle is required;

2. The theoretical contact angle is inconsistent with the contact angle under preload.

Therefore, it is urgent to propose a new technical solution to solve the problems in the prior art.

Contents of the invention

The application provides a contact diameter measuring device for an outer ring of an angular contact ball bearing and a method of use thereof, which are used to solve the problem that the contact diameter of the outer ring of the bearing is difficult to measure in the existing bearing production process, resulting in low bearing contact angle control accuracy.

In order to achieve the above object, the application provides the following technical solutions:

On the one hand, the present application provides a contact diameter measurement device for the outer ring of an angular contact ball bearing, which includes a measurement platform, a reference plate is arranged in parallel and spaced above the measurement platform, and a main shaft is installed on the reference plate, and one end of the main shaft is It is rotatably connected with the reference plate, and the other end is extended toward the measurement platform, and the end is equipped with a measurement standard cone and a cage equipped with a measurement ball. The main shaft is connected with the driving assembly, and the driving assembly is used to drive the main shaft along its The central axis reciprocates and applies a measuring load to the main shaft, and is used to drive the main shaft to rotate along its central axis;

The position on the measuring platform opposite to the main shaft forms a measuring station, the measuring station is used to install the outer ring under test, the sensor assembly is arranged on the measuring platform, and the sensor assembly is used to measure and display the outer ring under test The difference between the contact diameter value and the contact diameter value of the outer ring for calibration;

Driven by the drive assembly, the main shaft approaches the outer ring under test, and the measuring standard cone and cage are installed correspondingly to the outer ring under test, the measuring ball interferes with the outer ring under test, and the measuring standard cone and the sensor assembly corresponding to the probe.

In the above technical solution, a mounting hole is opened on the reference plate, a guide cylinder liner is arranged in the installation hole, a channel is formed on the guide cylinder liner to allow the main shaft to pass through, and a circle of concave holes is formed on the inner wall of the channel. Groove, the groove forms the installation position of the air bearing guide sleeve, one end of the main shaft passes through the guide cylinder liner and connects with the first end cover, the air bearing is installed in the first end cover, and the main shaft and the first end cover The air bearings are connected, and an air nozzle is arranged on the first end cover, and the air nozzle is used to inject pressurized air to the air bearing, so that the air bearing and the main shaft rotate.

Further, the other end of the main shaft passes through the guide cylinder liner and is connected with the measuring standard cone and the cage; the guide cylinder liner is connected with the second end cover, and an air bearing is arranged in the second end cover and an air bearing guide sleeve, the second end cover is provided with an air nozzle, and the main shaft passes through the second end cover and is connected with the measuring standard cone.

Further, the drive assembly includes a drive cylinder and an air nozzle, the drive cylinder is connected to the main shaft, and the main shaft is driven by the drive cylinder to reciprocate along the guide cylinder liner.

Further, one end of the main shaft forms a stepped structure for installing the measuring standard cone and the holder, the measuring standard cone is a conical structural member, and the center position of the measuring standard cone forms a shaft that is adapted to be installed on the main shaft. The through hole, the outer wall of the measuring standard cone is equipped with the retainer, and the retainer is used to limit the installation of several measuring balls installed thereon.

Further, a limit structure is provided at the end of the step structure, and the limit structure is used to realize the installation limit of the measuring standard cone and the holder.

Further, a groove is provided on the measuring station, and the groove corresponds to the main shaft. When the measuring standard cone and the cage are installed on the outer ring under test, the end of the main shaft extends into the In the groove, and there is an interval from the bottom of the groove; the bottom of the groove forms a through hole for installing the probe of the sensor, the through hole corresponds to the end of the main shaft, and the probe of the sensor assembly It is firmly connected with the measuring platform through the lock nut.

Further, an installation position for installing a protective fulcrum is formed on the measurement platform close to the groove wall. When the end of the measurement standard cone collides with the surface of the measurement platform, the end of the measurement standard cone The part is correspondingly connected with the protection fulcrum.

Further, the protection fulcrum includes metal screws.

Further, the central axis of the main shaft is perpendicular to the surface of the measurement platform.

Further, the measurement platform is installed on a workbench, and a plurality of uprights are arranged on the workbench, and the uprights are connected with the reference plate.

Further, the sensor assembly includes a sensor probe, a processor connected to the sensor probe, and a display connected to the processor.

In another aspect, the present application provides a method for using a contact diameter measuring device for an outer ring of an angular contact ball bearing, including the following steps:

S1: Calibration, place the outer ring for calibration on the measuring station, the measuring standard cone and the cage with the measuring ball move down with the main shaft, when the measuring ball is in contact with the outer ring for calibration, Apply a measurement load on the above-mentioned spindle, when the measurement load is loaded to the target measurement load, set the display value of the sensor component to "0" point to complete the calibration;

S2: Measure, place the outer ring under test on the measuring station, measure the standard cone and the cage equipped with the measuring ball and move down with the main shaft, when the measuring ball is in contact with the outer ring under test, The target measurement load is applied to the spindle, and the sensor assembly displays the measured value, which is the difference between the contact diameter value of the outer ring under test and the contact diameter value of the outer ring for calibration.

Compared with the prior art, the present application has the following beneficial effects:

The application provides a device for measuring the contact diameter of the outer ring of an angular contact ball bearing. The device includes a measuring platform. A reference plate is arranged above the measuring platform. A spindle is installed on the reference plate. There is a measuring standard cone and a cage equipped with a measuring ball. The main shaft is connected with the driving assembly. The driving assembly can drive the main shaft to reciprocate along its central axis and apply a measurement load to the main shaft, and can also drive the main shaft to rotate along the central axis; on the measuring platform The position opposite to the main shaft forms a measuring station, on which the tested outer ring is installed, and the sensor assembly on the measuring platform can measure and display the difference between the contact diameter value of the tested outer ring and the contact diameter value of the calibration outer ring. Therefore, the angular contact ball bearing outer ring contact diameter measuring device provided by this application can measure the contact diameter of the outer ring of the bearing, ensure the actual contact angle detection accuracy, and cooperate with the bearing inner ring contact diameter to realize the direct assembly of the bearing, and at the same time ensure the angular contact The contact angle of the ball bearing can reduce the deviation between the actual contact angle and the theoretical contact angle, and ensure the reliable installation and use of the bearing. Further, the measurement load loaded on the measurement device provided by the present application is variable, which can adapt to the assembly and pairing of angular contact bearings under different pairing loads.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings that need to be used in the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For Those skilled in the art can also obtain other drawings based on these drawings without any creative work. It should be understood that the specific shapes and structures shown in the accompanying drawings should generally not be regarded as limiting conditions for the implementation of the present application; for example, those skilled in the art are able to The increase/decrease/attribution division, specific shape, positional relationship, connection mode, size ratio relationship, etc. of some units (parts) are easy to make conventional adjustments or further optimization.

Figure 1 is a schematic diagram of back-to-back DB installation of two sets of angular contact ball bearings;

Figure 2 is a schematic diagram of two sets of angular contact ball bearings installed face to face DF;

Figure 3 is a schematic diagram of DT type installation of two sets of angular contact ball bearings in series;

Figure 4 is a schematic diagram of the installation of the triple angular contact ball bearing TBT type;

Figure 5 is a schematic diagram of the installation of the triple angular contact ball bearing TFT type;

Figure 6 is a schematic diagram of the installation of triple angular contact ball bearing TT;

Figure 7 is a schematic diagram of the principle of measuring the contact diameter of the bearing outer ring;

Fig. 8 is a schematic structural diagram of a contact diameter measuring device for an outer ring of an angular contact ball bearing provided by the present application.

Explanation of reference signs:

1. Workbench; 2. Column; 3. Bolt; 4. Datum plate; 5. Fastening bolt; 6. Guide cylinder liner; 7. Air bearing guide sleeve; 8. First end cover; 9. Air nozzle; 10 , main shaft; 11, second end cover; 12, measuring standard cone; 13, cage; 14, tested outer ring; 15, measuring ball; 16, measuring platform; 17, protective fulcrum; 18, limit structure; 19 , fixed seat; 20, lock nut; 21, sensor probe.

Detailed ways

The present application will be further described in detail through specific embodiments below in conjunction with the accompanying drawings.

In the description of this application: unless otherwise specified, "plurality" means two or more. The terms "first", "second", and "third" in this application are intended to distinguish the referred objects, and have no special meaning in terms of technical connotation (for example, it should not be understood as a reference to the degree of importance or order, etc. emphasis). Expressions such as "comprising", "including", and "having" also mean "not limited to" (certain elements, components, materials, steps, etc.).

Terms such as "upper", "lower", "left", "right", "middle", etc. quoted in this application are usually for the convenience of intuitive understanding with reference to the drawings, rather than absolute terms for the positional relationship in the actual product limited. Without departing from the technical concept disclosed in this application, changes in these relative positional relationships should also be regarded as the scope of this application.

Embodiment one

In order to solve the problems existing in the prior art, the present application provides a contact diameter measuring device for an outer ring of an angular contact ball bearing. The contact diameter measuring device for the outer ring of the angular contact ball bearing provided by this application can measure the contact diameter of the outer ring of the bearing, and the direct assembly of the bearing can be realized by matching the contact diameter of the outer ring of the bearing, while ensuring the contact angle of the angular contact ball bearing and reducing the actual contact The deviation between the contact angle and the theoretical contact angle ensures the reliable installation and use of the bearing. At the same time, the measuring device provided by the application can measure the contact point groove diameter of the bearing outer ring, which solves the problem that there is no special instrument for measuring the contact diameter of the bearing outer ring at home and abroad, and fills the gap in the market. The measurement principle of the measuring device for measuring the contact diameter of the bearing outer ring is as follows:

When the angular contact ball bearing is working, there is a certain angle between the contact point of the bearing rolling body and the inner and outer rings. When the bearing is manufactured, the diameter of the contact point of the outer ring is indirectly guaranteed by controlling the assembly clearance and the diameter of the groove bottom of the outer ring. The measurement principle of the measuring device provided by this application is to simulate the state of the finished bearing after bearing assembly, directly measure the contact diameter of the outer ring of the bearing through the standard measuring cone, and measure the half-cone angle of the standard cone as the contact angle of the bearing.

Referring to Fig. 7, the measurement principle of the contact diameter of the bearing outer ring is shown. The contact diameter of the bearing outer ring can also be called the groove contact diameter or ring contact diameter of the bearing outer ring. In the figure: D2j is the contact diameter of the measuring standard cone, α is the design contact angle of the bearing, D1j is the contact diameter under the contact angle α of the outer ring of the bearing, Dw is the diameter of the measuring ball used for measurement, and D20 is the calibrated standard diameter ( That is, the standard contact diameter of the inner ring), δ is the protrusion of the bearing, A is the reference plane of the bearing, C is the nominal width of the bearing, and the axial load F _a , which has the following equation relationship:

D2j = D20+2δ/tanα＝D1j -2Dw* cosα (2)

Therefore, in the case of known Dw and α angle, as long as the value of D2j is measured, the value of contact diameter D1j can be indirectly measured.

The structure of the contact diameter measuring device for the outer ring of the angular contact ball bearing will be described in detail below in conjunction with the accompanying drawings:

Referring to Fig. 8, the angular contact ball bearing outer ring contact diameter measurement device provided by the present application includes a measurement platform 16, and a reference plate 4 is arranged at a parallel interval above the measurement platform 16, and a main shaft 10 is installed on the reference plate 4, and one end of the main shaft 10 is connected to the The reference plate 4 is rotatably connected, the other end extends toward the measuring platform 16 and the end is equipped with a measuring standard cone 12 and a cage 13 equipped with a measuring ball 15, the main shaft 10 is connected with the driving assembly, and the driving assembly is used to drive the main shaft 10 along its The central axis reciprocates and applies a measuring load to the main shaft 10 to drive the main shaft 10 to rotate along the central axis. The position opposite to the main shaft 10 on the measuring platform 16 forms a measuring station, the measuring station is used to install the tested outer ring 14, the measuring platform 16 is provided with a sensor assembly, the sensor assembly is used to measure and display the contact diameter of the tested outer ring 14 The difference between the value and the contact diameter value of the outer ring for calibration. Driven by the drive assembly, the main shaft 10 approaches the tested outer ring 14, and the measuring standard cone 12 and the cage 13 are installed correspondingly to the tested outer ring 14, the measuring ball 15 is in conflict with the tested outer ring 14, and the measuring standard cone 12 corresponds to the probe of the sensor assembly. Therefore, through structural design, a measuring station is formed on the measuring device provided by the application, and a measuring structure is arranged above the measuring station. The measuring structure includes a main shaft 10 and a measuring standard cone 12 and a holder 13 arranged on the main shaft 10. The measuring standard cone 12 and the cage 13 are standard parts, and the standard part is used as a test reference to measure and calculate the tested part. The device needs to be calibrated when it is put into use. When the instrument is calibrated, it is necessary to use the outer ring for calibration to complete the zero point calibration of the sensor. The outer ring for calibration is also a standard part.

In one embodiment, the reference plate 4 provided by the present application is provided with a mounting hole, and a guide cylinder liner 6 is arranged in the installation hole, and a channel that allows the main shaft 10 to pass through is formed on the guide cylinder liner 6, and a ring is formed on the inner wall of the channel. Groove, the groove forms the installation position of the air bearing guide sleeve 7, one end of the main shaft 10 passes through the guide cylinder liner 6 and then connects with the first end cover 8, the first end cover 8 is equipped with an air bearing, and the main shaft 10 is connected with the air bearing , the first end cover 8 is provided with an air nozzle 9, and the air nozzle 9 is used to inject pressure air to the air bearing, so that the air bearing and the main shaft 10 rotate. The other end of the main shaft 10 passes through the guide cylinder liner 6 and is connected with the measuring standard cone 12 and the cage 13; the guide cylinder liner 6 is connected with the second end cover 11, and the second end cover 11 is provided with an air bearing and an air bearing guide sleeve. The second end cover 11 is provided with an air nozzle, and the main shaft 10 passes through the second end cover 11 and is connected with the measuring standard cone 12 . Therefore, the air bearing provided on the main shaft 10 ensures stable rotation of the main shaft 10 .

In one embodiment, the driving assembly includes a driving cylinder and an air nozzle 9, the driving cylinder is connected to the main shaft 10, the main shaft 10 is driven by the driving cylinder to reciprocate along the guide cylinder liner 6, and the driving cylinder can also be used to apply a measuring load to the main shaft 10 .

In one embodiment, one end of the main shaft 10 forms a stepped structure for installing the measuring standard cone 12 and the cage 13, the measuring standard cone 12 is a conical structure, and the center position of the measuring standard cone 12 is formed to fit the main shaft 10. The through hole for installation, the outer wall of the measuring standard cone 12 is equipped with a cage 13, the cage 13 is used to install and limit several measuring balls 15 installed on it; the position near the end of the step structure is limited Position structure 18, the limit structure 18 is used to realize the installation limit of the measuring standard cone and the holder.

In one embodiment, a groove is provided on the measuring station, and the groove corresponds to the main shaft 10. When the measuring standard cone 12 and the cage 13 are installed on the outer ring 14 to be tested, the end of the main shaft 10 extends into the In the groove, and there is an interval from the bottom of the groove; the bottom of the groove forms a through hole for installing the probe of the sensor, the through hole corresponds to the end of the main shaft 10, and the sensor probe 21 is connected to the measuring platform 16 through the lock nut 20 Tightly connected.

In one embodiment, an installation position for installing the protection fulcrum 17 is formed on the measuring platform 16 near the groove wall, and when the end of the measuring standard cone 12 conflicts with the surface of the measuring platform 16, the measuring standard cone The end of 12 is connected with protection fulcrum 17 correspondingly. The protective fulcrum 17 can be a metal screw fastened on the measurement platform, and of course it can also be other metal parts that can support and protect.

In one embodiment, the central axis of the spindle 10 is perpendicular to the surface of the measurement platform 16 . The measurement platform 16 is installed on the workbench 1 , and the workbench 1 is provided with a plurality of columns 2 , and the columns 2 erect the reference plate 4 above the measurement platform 16 .

In one embodiment, the sensor assembly includes a sensor probe 21, a processor connected to the sensor probe 21, and a display connected to the processor. The sensor assembly is mainly used to display the difference between the contact diameter value of the measured outer ring 14 and the contact diameter value of the outer ring for calibration. The structural connection relationship of the sensor components provided in the present application can be realized through adaptive installation according to the conventional connection relationship of the sensor probe 21 , the processor and the display.

The contact diameter measuring device for the outer ring of the angular contact ball bearing provided by this application can measure the contact diameter of the outer ring of the bearing. With the contact diameter of the inner ring of the bearing, the direct assembly of the bearing can be realized, and the contact angle of the angular contact ball bearing can be guaranteed at the same time, reducing the actual The deviation between the contact angle and the theoretical contact angle ensures the reliable installation and use of the bearing. Further, the measurement load loaded on the measurement device provided by the present application is variable, which can adapt to the assembly and pairing of angular contact bearings under different pairing loads.

Embodiment two

Based on the device for measuring the contact diameter of the outer ring of the angular contact ball bearing provided above, this embodiment provides a method for using the device for measuring the contact diameter of the outer ring of the angular contact ball bearing. When the measuring device is put into use, it needs to be calibrated first, which can reduce errors and improve detection precision and accuracy.

The contact diameter measurement device for the outer ring of the angular contact ball bearing provided by this application adopts a relative measurement method. Before the measurement, the zero position of the sensor is firstly calibrated with a standard part (outer ring for calibration), and then the contact diameter of the outer ring under test is measured.

(1) Calibration of the instrument:

Before calibration, the main shaft 10 is in the upper state under the action of the cylinder, the standard part for calibration (that is, the outer ring for calibration) is placed on the measurement platform, and the measurement standard cone 12 (the half angle of the cone is the bearing contact angle) installed on the main shaft 10 and the measurement The ball 15 (for the assembly ball) moves close to the measuring station with the main shaft under the action of the driving cylinder, the main shaft 10 rotates under the action of the air nozzle 9, the measuring ball 15 enters the measuring station correctly, and then applies the target measuring load to the measuring main shaft 10, Set the display value of the sensor component at this time to "0" point, and the calibration of the instrument is completed.

(2) Measurement of the contact diameter of the bearing outer ring:

Before the measurement, the main shaft 10 is in the upper state under the action of the cylinder, the outer ring 14 to be tested is placed on the measurement platform, and the measuring standard cone 12 (the half angle of the cone is the bearing contact angle) and the measuring ball 15 (for the assembly ball) installed on the main shaft 10 are in the upper state. ) moves closer to the measuring station with the main shaft under the action of the driving cylinder, the main shaft 10 rotates under the action of the air nozzle 9, the measuring ball 15 enters the measuring station correctly, and then applies the target measuring load to the measuring main shaft 10, at this time the sensor assembly will display The measured value m, m is the difference between the contact diameter value of the measured outer ring and the contact diameter value of the outer ring for calibration.

The technical features of the above embodiments can be combined arbitrarily (as long as there is no contradiction in the combination of these technical features), for the sake of concise description, all possible combinations of the various technical features in the above embodiments are not described; these are not clear All the written examples should also be regarded as within the scope of the description in this specification.

The present application has been described more specifically and in detail through general descriptions and specific examples above. It should be understood that based on the technical concept of the present application, some conventional adjustments or further innovations can also be made to these specific embodiments; Also fall within the protection scope of the claims of the present application.

Claims (10)

1. A contact diameter measuring device for an outer ring of an angular contact ball bearing, characterized in that it comprises a measuring platform, a reference plate is arranged at parallel intervals above the measuring platform, a main shaft is installed on the said reference plate, and one end of the main shaft It is rotatably connected with the reference plate, and the other end is extended toward the measurement platform, and the end is equipped with a measurement standard cone and a cage equipped with a measurement ball. The main shaft is connected with the driving assembly, and the driving assembly is used to drive the main shaft along its The central axis reciprocates and applies a measuring load to the main shaft, and is used to drive the main shaft to rotate along its central axis; The position on the measuring platform opposite to the main shaft forms a measuring station, the measuring station is used to install the outer ring under test, the sensor assembly is arranged on the measuring platform, and the sensor assembly is used to measure and display the outer ring under test The difference between the contact diameter value and the contact diameter value of the outer ring for calibration; Driven by the drive assembly, the main shaft approaches the outer ring under test, and the measuring standard cone and cage are installed correspondingly to the outer ring under test, the measuring ball interferes with the outer ring under test, and the measuring standard cone and the sensor assembly corresponding to the probe. 2. The contact diameter measurement device for the outer ring of an angular contact ball bearing according to claim 1, wherein a mounting hole is provided on the reference plate, a guide cylinder liner is arranged in the installation hole, and the guide cylinder liner A channel that allows the main shaft to pass through is formed on the upper part of the channel. A groove is formed on the inner wall of the channel. The groove forms the installation position of the air bearing guide sleeve. One end of the main shaft passes through the guide cylinder liner and connects with the first end cover. The air bearing is installed in the first end cover, the main shaft is connected with the air bearing, and the air nozzle is arranged on the first end cover, and the air nozzle is used to inject pressure air to the air bearing , causing the air bearing to rotate with the spindle. 3. The contact diameter measuring device for the outer ring of an angular contact ball bearing according to claim 2, wherein the other end of the main shaft is connected to the measuring standard cone and the cage after passing through the guide cylinder liner; The guide cylinder liner is connected with the second end cover, the second end cover is provided with an air bearing and an air bearing guide sleeve, the second end cover is provided with an air nozzle, and the main shaft passes through the rear of the second end cover Connected to the measuring standard cone. 4. The contact diameter measurement device for the outer ring of an angular contact ball bearing according to claim 3, wherein the drive assembly includes a drive cylinder and an air nozzle, the drive cylinder is connected to the main shaft, and the main shaft is driven The cylinder is driven to reciprocate along the guide cylinder liner. 5. The contact diameter measuring device for the outer ring of an angular contact ball bearing according to claim 1, wherein one end of the main shaft forms a stepped structure for installing the measuring standard cone and the cage, and the measuring standard cone It is a conical structure, the central position of the measuring standard cone forms a through hole fitted with the main shaft, the outer wall of the measuring standard cone is equipped with the holder, and the holder is used for mounting on it Several measuring balls for installation limit; The end of the step structure is provided with a limit structure, and the limit structure is used to realize the installation limit of the measuring standard cone and the holder. 6. The device for measuring the contact diameter of the outer ring of an angular contact ball bearing according to claim 5, wherein a groove is provided on the measuring station, and the groove corresponds to the main shaft, when the measuring standard cone When the cage is installed on the outer ring under test, the end of the main shaft extends into the groove and is spaced from the bottom of the groove; the bottom of the groove forms a through hole for installing the probe of the sensor , the through hole corresponds to the end of the main shaft, and the probe of the sensor assembly is fastened to the measurement platform through a lock nut. 7. The device for measuring the contact diameter of the outer ring of an angular contact ball bearing according to claim 6, wherein an installation position for installing a protective fulcrum is formed on the measurement platform close to the wall of the groove, when the measurement standard When the end of the cone collides with the surface of the measuring platform, the end of the measuring standard cone is in contact with the protection fulcrum correspondingly; The protective fulcrum includes a metal screw. 8. The contact diameter measuring device for the outer ring of an angular contact ball bearing according to claim 1, wherein the central axis of the main shaft is perpendicular to the surface of the measuring platform; The measuring platform is installed on a workbench, and a plurality of uprights are arranged on the workbench, and the uprights are connected with the reference plate. 9. The angular contact ball bearing outer ring contact diameter measuring device according to claim 1, wherein the sensor assembly includes a sensor probe, a processor connected to the sensor probe, and a processor connected to the processor monitor. 10. A method for using the contact diameter measuring device for the outer race of an angular contact ball bearing according to claim 1, characterized in that it comprises the following steps: S1: Calibration, place the outer ring for calibration on the measuring station, the measuring standard cone and the cage with the measuring ball move down with the main shaft, when the measuring ball is in contact with the outer ring for calibration, Apply a measurement load on the above-mentioned spindle, when the measurement load is loaded to the target measurement load, set the display value of the sensor component to "0" point to complete the calibration; S2: Measure, place the outer ring under test on the measuring station, measure the standard cone and the cage equipped with the measuring ball and move down with the main shaft, when the measuring ball is in contact with the outer ring under test, The target measurement load is applied to the spindle, and the sensor assembly displays the measured value, which is the difference between the contact diameter value of the outer ring under test and the contact diameter value of the outer ring for calibration.